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(2x+3x)=90
We move all terms to the left:
(2x+3x)-(90)=0
We add all the numbers together, and all the variables
(+5x)-90=0
We get rid of parentheses
5x-90=0
We move all terms containing x to the left, all other terms to the right
5x=90
x=90/5
x=18
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